Poster Number 643
See more from this Division: Gulf Coast Association of Geological Societies
See more from this Session: GCAGS Poster Session (Posters)
Abstract:
Well cuttings and sidewall core samples from sixteen wells known to contain volcanic ash were density separated using lithium metatungstate to isolate the low-density volcanic glass from the remaining minerals. The concentrated ash was dissolved and analyzed using ICP-MS. Trace and REE variations were plotted by depositional age based upon paleontological markers.
Variations in most trace elements are not useful criteria for discriminating ash by age. There is a wide spread in fairly mobile elements (ie. Ba), suggesting that each ash bed has had a different diagenetic history. REE variations, in particular the magnitude of the Europium anomaly, are good discriminates of each ash. A few anomalous samples plot within an older field, which might be explained by the reworking of older ash into younger deposits. Direct correlation to SRP-Yellowstone eruptions is hindered by the lack of SRP samples analyzed using similar methods.
See more from this Division: Gulf Coast Association of Geological Societies
See more from this Session: GCAGS Poster Session (Posters)